1234020421 has 4 divisors (see below), whose sum is σ = 1237193100. Its totient is φ = 1230847744.

The previous prime is 1234020413. The next prime is 1234020427. The reversal of 1234020421 is 1240204321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 575328196 + 658692225 = 23986^2 + 25665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1234020421 - 2³ = 1234020413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234020427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585756 + ... + 1586533.

It is an arithmetic number, because the mean of its divisors is an integer number (309298275).

Almost surely, 2^1234020421 is an apocalyptic number.

It is an amenable number.

1234020421 is a deficient number, since it is larger than the sum of its proper divisors (3172679).

1234020421 is an equidigital number, since it uses as much as digits as its factorization.

1234020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172678.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1234020421 is about 35128.6268020827. The cubic root of 1234020421 is about 1072.6073835423.

Adding to 1234020421 its reverse (1240204321), we get a palindrome (2474224742).

It can be divided in two parts, 12340 and 20421, that added together give a square (32761 = 181²).

The spelling of 1234020421 in words is "one billion, two hundred thirty-four million, twenty thousand, four hundred twenty-one".